Mijikamon

Chibi ad-libbed goodness. It's a quick watch, and it was intended to be watched after its respective episode, so it may have some spoilers of the original show. Expect some major cuteness in it.

The fact that it's ad-libbed is rather commendable, you can hear Ono's experience in this. That said, it's still a special, and it doesn't stand on its own.